macOS 10.15.3 (and all versions from 10.10 through to 10.14 at one stage or another)

The Radeon is actually the third video card. The original NVidia GT740 was replaced with a GTX-1080 Ti, but when Apple decided to go Radeon again and wouldn't play nicely with NVidia (or vice-versa) the NVidia Web drivers wouldn't work with macOS 10.15. Plus it was about time for a new video card anyway.

Now the system has the following OS's configured to multi-boot using Clover V2.0 r5100